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公开(公告)号：US3329885A
公开(公告)日：1967-07-04
申请号：US33497363
申请日：1963-12-30
Applicant: NAT RES DEV
Inventor： DENNIS GABOR , FREDERICK EUGELBERGER JOSEPH
IPC: H01J45/00
CPC classification number: H01J45/00
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